Stove furnace



FIG. 1 is a perspective view of a stove furnace showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a right side elevational view, the left side being a substantial mirror image thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for a stove furnace, as shown and described. 